Colored cellulose article.



UNITED STAlllS PATENT 'OFFICE,

oscila MLLER, or coLoGNE, GERMANY, AssIGNOR To THE FIRM or RHEINIs'cHEKUNsrsEIDE-ramun AKTIENGESELLSCHAFT, or COLOGNE, GERMANY.

COLORED CELLULOSE ARTICLE.

Cellulose Articles and the Processes of Mak# ing the Same-fof which thefollowing is a speciiication.

Formerly when 1 producing artificial threads, fibers, strips, -ilmsorthe like, from cellulose for instance cotton, suliite cellulose, thecellulose productsy obtained Were colorless or White and Were dyed inany desiredmanner as is done with articles of the natural fiber. thisdyeing could als'oibe effected by vproviding the cellulose solutionsfrom which the cellulose articles were produced, withthe suitablecoloring matter, 1N ow, (experimentsV have shown that whenl a certainraw cellulose materialisemployed, colored cellulose articles 'can bedirectly produced from the4 solutionsof the same. For this purpose, the

cellulose of cottonseed shells has proven suitablei- This result iseffected by forming a, solution of cottonseed'sliell cellulose, in asuitable solvent, .such as caustic alkali Withsulfuret of carbon,Schweitzers reagent, chlorid of zinc, and obtaining cellulose articlestherefrom ina suitable manner. This may be carried out practically'inthe follow` ving Way z-For instance, this. solution of the cottonseedshell cellulose is lpermitted to enter through openings of across-section which is adapted to thel cross-section of the 'cellulosearticles to be-produced', into a precipitat ing liquid 'of an acidnature. This solution may be of either an acid or acid salts, and

may also contain other salts, in which more of an acid nature, such assesqui-saltsjmay also be used. The threads, strips, etc. formed have acrosssection corresponding `to the opening and if desired, may besubjected to further treatment. Y In this Way cellulose products areobtained, which vary in color` Speeication of Letters Patent.Appiicauoafued mmh 29,'1906. serial No. 308,735.

UnderV certain circumstances' Patented Aug. 17, 1909.

according to the quantities of coloring matter left in the cottonseedshell cellulose employed, The colors vary' from red to the faintestyellow or White. The depth of the colormay. also be .regulated by addinga suitable quantity of the alkaline solution of coloring mattei'obtained ,durinf the produc- '.tion the cot'tonseed shell cell during,or after thedissolutionof the cellulose referred to. The solution ofcottonseed shell cellulose employed may also contain other cellulosematter, as for instance cotton,

etc. in solution, and it isimmaterial Whether' the shell cellulose isdissolved, mixed, or in conjunction vwith the other cellulose, orWhether `the solutions are .separately produced and then mixed. Theessential art is in' always having dissolved cottonseeds ell celullosepresent; By meansof this mixing, the desired color betweenv red andfaintest yellow or white can be secured.

The natural color produced by the rocess described can of course beconsidera lyfvaried in any suitable manner of treatment or additions,for instan of metal salts or col- -oringmatters` I claim as myinvention:

l. As a new product, an article containing the cellulose substanceofcotton seed shells .freed 'from the bindinggums of the latter, saidarticle being colored by the natural dyfstu'lf of said shells.

2. The process of producing colored cellulose articles Which consists indissolving a cellulose mass containing non fibrous cotton seed shellcellulose in which the natural dycst u'fl' of the shell is retained andprecipitat ing said cellulose in the desired forni with 'said dye-stuilpresent whereby an article col- -'ored by the natural. dye-stuff of theshell is obtained, substantially as described.

ln testimony whereof I have signed my name to this, specification, inthe presence of two subscribing Witnesses.

OSCAR MULLER.

1Witnesses 1 Bassin F. DUNLAP,

Louis VANDORN.

ulose before,

